Power Amplifiers Questions and Answers

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Showing 10 of 55 questions
Q1
Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied.
  • A TRUE
  • B FALSE
Answer: Option A
Q2
The main features of a large-signal amplifier is the circuit's ________.
  • A power efficiency
  • B maximum power limitations
  • C impedance matching to the output device
  • D All of the above
Answer: Option D
Q3
The principal advantage(s) of BJTs over MOSFETs is (are) that
  • A voltage drop across the transistor is important.
  • B they are not as prone to ESD.
  • C both of the above
  • D none of the above
Answer: Option C
Q4
What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the windings?
  • A N2/N1
  • B (N1/N2)2
  • C (N1/N2)1/3
  • D N1 × N2
Answer: Option A
Q5
Class ________ amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input.
  • A A
  • B B
  • C C
  • D AB
Answer: Option D
Q6
Which type of power amplifier is biased for operation at less than 180º of the cycle?
  • A Class A
  • B Class B or AB
  • C Class C
  • D Class D
Answer: Option C
Q7
Class AB operation is ________ operation.
  • A similar to class A
  • B similar to class B
  • C similar to class C
  • D None of the above
Answer: Option D
Q8
The principal advantage(s) of MOSFETs over BJTs is (are)
  • A their biasing networks are simpler.
  • B their drive requirements are simpler.
  • C they can be connected in parallel for added drive capability.
  • D all of the above
Answer: Option D
Q9
Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?
  • A Digital multimeter
  • B Spectrum analyzer
  • C Oscilloscope
  • D Wave analyzer
Answer: Option D
Q10
In class B operation, at what fraction of VCC should the level of VL(p) be to achieve the maximum power dissipated by the output transistor?
  • A 0.5
  • B 0.636
  • C 0.707
  • D 1
Answer: Option B

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